Can I just wear a shawl over my tank top?

Yes, but it must be draped securely over your shoulders, not just sitting loosely. If the security guard thinks it's too transparent, they may still deny entry.

Are leggings allowed?

Strictly speaking, no. Leggings are considered 'tight-fitting' clothing, which is disrespectful in Buddhist temples. Wear loose linen or cotton pants instead.

Do I need to cover my head?

No, head coverings are not required for general temple visits in Thailand. Just ensure your shoulders and knees are covered.

How to dress for temples in Thailand

Cover your shoulders and knees completely to show respect. Carry a lightweight sarong or scarf in your bag to wrap around your waist or shoulders if you are wearing sleeveless shirts or shorts.

Check your hemline. Skirts, dresses, and trousers must fall below the knee. Avoid ripped jeans with holes above the knee, even if they are trendy; guards often turn these away.
Cover your shoulders. Tank tops, spaghetti straps, and off-the-shoulder tops are prohibited. A T-shirt with sleeves is the safest bet. If wearing a tank top, ensure you have a dedicated scarf to cover your upper arms and chest.
Select the right footwear. Wear shoes that are easy to slip on and off, as you must leave your footwear outside the temple entrance. Socks are helpful if you prefer not to walk barefoot on hot stone floors.
Use your 'temple kit'. If you are caught off guard, most major temples (like the Grand Palace) have rental clothing booths. However, they are often sweaty and overpriced. Carry a lightweight linen sarong in your day bag to tie around your waist over shorts.

Can I just wear a shawl over my tank top?: Yes, but it must be draped securely over your shoulders, not just sitting loosely. If the security guard thinks it's too transparent, they may still deny entry.
Are leggings allowed?: Strictly speaking, no. Leggings are considered 'tight-fitting' clothing, which is disrespectful in Buddhist temples. Wear loose linen or cotton pants instead.
Do I need to cover my head?: No, head coverings are not required for general temple visits in Thailand. Just ensure your shoulders and knees are covered.